Amana GUC-X, Installation Instructions Manual

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14
EXAMPLE:
An installation calls for a 45,000 Btuh furnace. It must
be vented 35 inside feet and use two inside medium
radius 90° elbows on both inlet and exhaust. With this in
mind, we must look at Table 1 to determine the correct
vent and air intake pipe size. With two elbows and 35
feet of straight pipe, 3 inch air intake pipe must be used
and 2 inch vent pipe.
45,000 BTUH Furnace
No. Of Vent Inside Feet Of Straight Pipe Each Run
Elbow s Type 5 - 10 10 - 15 15 - 20 20 - 25 25 - 30 30 - 35 35 - 40
1
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
2
2
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
2
3
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
2
4
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
2
Table 1
IMPORTANT: When three inch diameter exhaust pipe
is used, the transition from two inch to three inch pipe
must be made in a vertical run. This is necessary for
proper condensate drainage and pressure switch opera-
tion.
70,000 BTUH Furnace
No. Of Vent Inside Feet Of Straight Pipe Each Run
Elbow s Type 5 - 10 10 - 15 15 - 20 20 - 25 25 - 30 30 - 35 35 - 40
1
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
2
2
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
2
3
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
2 3
3
4
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
3 3
3
Table 2
90,000 BTUH Furnace
No. Of Vent Inside Feet Of Straight Pipe Each Run
Elbow s Type 5 - 10 10 - 15 15 - 20 20 - 25 25 - 30 30 - 35 35 - 40
1
Inlet
Outlet
3
2 3
2 3
2 3
2 3
2 3
3 3
3
2
Inlet
Outlet
3
2 3
2 3
2 3
2 3
3 3
3 3
3
3
Inlet
Outlet
3
2 3
2 3
2 3
2 3
3 3
3 3
3
4
Inlet
Outlet
3
2 3
2 3
2 3
3 3
3 3
3 3
3
Table 3
115,000 BTUH Furnace
No. Of Vent Inside Feet Of Straight Pipe Each Run
Elbow s Type 5 - 10 10 - 15 15 - 20 20 - 25 25 - 30 30 - 35 35 - 40
1
Inlet
Outlet
3
3 3
3 3
3 3
3 3
3 3
3 3
3
2
Inlet
Outlet
3
3 3
3 3
3 3
3 3
3 3
3 3
3
3
Inlet
Outlet
3
3 3
3 3
3 3
3 3
3 3
3 3
3
4
Inlet
Outlet
3
3 3
3 3
3 3
3 3
3 3
3 3
3
Table 4
Vent Pipe Installation
The size of the vent and air intake pipes is determined
by the heating capacity of the furnace and the length
and number of elbows of the pipe runs. To properly size
the pipes, refer to the previous section.
Use only the fittings, primer, and solvent cement which
are described in previous section. An air intake screen
(as described in previous section) must be installed.
This screen is supplied with the furnace. Do not place a
screen in the exhaust vent termination. It is not needed,
and the furnace flue products could cause it to corrode.